2.4" #31 toroids are in-stock, $5.24 each at
www.arrow.com
type 2631803802 in the search box
#31 big clamp-ons are also in-stock, $12.43 each
type 0431177081 in the search box
Dave Hachadorian, K6LL
Yuma, AZ
-----Original Message-----
From: Jim Brown
Sent: Tuesday, November 02, 2010 1:38 PM
To: rfi@contesting.com
Subject: Re: [RFI] Direct TV DVR problems
On 11/2/2010 1:07 PM, Howard Lester wrote:
> Jim, are you referring to the number of turns required as a
> function of the operating frequency?
I'm referring both to the winding instructions and also the
various
discussions of how RFI occurs and how to kill it.
> And yes, the Amidon ferrites I bought long ago were FT-240's.
They are NOT Amidon ferrites, they are Fair-Rite toroids, with a
VERY
high markup added by Amidon. AND the cores you bought from Amidon
are
almost certainly not #31. The wholesale cost of these cores is
about
$4 in lots of 100 or more. Last I heard, Amidon and other ham
vendors
were selling them for something like $15. Not a fair price.
Appendix One of that tutorial includes advice about how and where
to buy
ferrites and which ones to buy.
73, Jim K9YC
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